I've followed fedora core 4 perfect setup and no more changes were done, I've check ISPConfig settings and /etc/named is chosen.
Don't know what other part to look for!

Thanks

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You must tell your domain registrar that your ISPConfig server should be the authoritative name servers for acui.org.co, and then you must create DNS records for that domain on your ISPConfig systems. Also take a look at this tutorial: http://www.howtoforge.com/ispconfig_dns_godaddy